钢管混凝土拱桥施工全过程稳定性分析

摘要

大跨度钢管混凝土拱桥常采用缆索吊装斜拉扣挂法施工.应用有限元软件,针对某中承式钢管混凝土拱桥建立了从拱肋吊装至成桥的全过程计算模型,并对该有限元模型进行了稳定性分析,得出各工况下结构的稳定安全系数,最后讨论了设置横向风缆对拱肋稳定性的影响.结果表明,该桥施工各阶段稳定性均满足规范要求.%Lang span concrete-filled steel tube (CFST) arch bridge is constructed usually by lane cable. In this paper,a three-dimensional finite element model is built for the 220 m half-through CFST arch bridge. Its stability factor and the instability mode are given under the specific construction stage. Finally, the effect of guy-cable on the stability of arch ribs is studied. The analysis results show that the stability can meet the requirements of related codes during different construction stages.